Of course, other factors will play into how fast a line moves and how many people are on it, including how many items each person has (in a checkout line) and superstition, but, all other things being equal, try going against the grain and veer left instead of right.

Quite possibly. I'm pretty certain that the left queue isn't the quickest one in Aus from my observations. Though I think with supermarkets there are too many random factors that can effect the queue length. You just need one price check and you're predicted shorter queue is suddenly the longer waiting time. Self checkout isn't always the quickest option either because the machines are really picky and why should I bother to learn the nuances of their machines when I can just let someone do all the work for me?

Does this depend on whether you are in a drive on the right or drive on the left country?

I remember many years ago I got off a Eurail train with an American girl I had just met. We walked along a subway under the platforms. I was on the right. When we got to the T intersection at the end where there was no indication which was the "correct" way to turn we collided because she wanted to turn right and I wanted to turn left. For each of us that was the safest and easiest turn when driving because you don't have to cross the traffic.

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